tailieunhanh - Photoshop cs5 cho nhiếp ảnh gia part 64

Giảm nhiễu Mặc dù bạn có thể chèn thêm các bước để giảm tiếng ồn sớm hơn trong công việc của bạn, tiếng ồn thường trở nên rõ ràng hơn khi bạn đang chuẩn bị hình ảnh của bạn cho đầu ra. | 398 CHAPTER 10 OUTPUT Note When you make adjustments that affect the actual pixel dimensions of the image in the Image Size dialog box the current size is displayed after the Pixel Dimensions label with the starting size shown in parentheses. For images that will be displayed digitally on a monitor or digital projector the size should be adjusted using the Width or Height text boxes in the Pixel Dimensions section. This allows you to set the specific pixel sizing for your intended purpose. For a digital slide show for example you might set these dimensions to fit within the resolution of your digital projector. For a website you might set them to a standard output size you deem appropriate for your specific site design. Note Check the resolution of your projector and use those values to set the height or width to resize images that you ll use in a slide show. Many projectors have a native resolution of 1024 x 768 while others may be 1400 x 1050 and so on. Your images must fit within those specifications. Once you ve established the sizing parameters in the Image Size dialog box click OK and Photoshop resizes the image accordingly. Note Some people are tempted to wait and resize in the Print dialog box. We don t recommend that because for best results you need to sharpen your image based on its final size. If you wait to resize in the Print dialog box you have to do the sharpening before resizing. You d be surprised how different the results can be. Reducing Noise Although you could insert steps to reduce noise earlier in your workflow noise often becomes more apparent as you are preparing your image for output. Whether you opt to apply it at the beginning of your workflow or after optimizing the image we recommend applying any noise reduction before you apply sharpening to make sure the process of sharpening won t exaggerate the noise. Note Some people may opt to apply noise reduction on the master image in the traditional workflow. Others prefer to wait until they